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Simplifying (7 + 2a) + 3a = 0 Remove parenthesis around (7 + 2a) 7 + 2a + 3a = 0 Combine like terms: 2a + 3a = 5a 7 + 5a = 0 Solving 7 + 5a = 0 Solving for variable 'a'. Move all terms containing a to the left, all other terms to the right. Add '-7' to each side of the equation. 7 + -7 + 5a = 0 + -7 Combine like terms: 7 + -7 = 0 0 + 5a = 0 + -7 5a = 0 + -7 Combine like terms: 0 + -7 = -7 5a = -7 Divide each side by '5'. a = -1.4 Simplifying a = -1.4
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